How to transform MultiMap<String, String> to MultiMap<String,Integer>? [closed]

Question

I got the following Multimap, How could I transform it to MultiMap<String,Integer> ?

Multimap<String, String> multimap= // contents here

Answer 1

Use Multimaps#transformValues(Multimap, Function):

Multimap<String, Integer> transformed = Multimaps.transformValues(multimap,
    new Function<String, Integer>() {
        @Override public Integer apply(String value) {
          return Integer.valueOf(value);
        }
    });

See also:

• NewCollectionTypesExplained#Multimap
• CollectionUtilitiesExplained#Multimaps
• FunctionalExplained

or in Java 8+:

Multimap<String, Integer> transformed =
    Multimaps.transformValues(multimap, Integer::valueOf);